Turn-table for gramophone-machines.



PATENTED JUNE 23, 1-908.

11H. 'MOBLEL p TABLE FOR GRAMOPHONE MAGHINES.

TURN

ABPLIOATION r1121) OOT.12.1906.

4O insures its speed remaining steady.

it may concern; p I n jihatLEDWIN H. Moment, of nt'gomery county, State of Penn si, n a,

" -Tab les for Gramophone-Machines, of

" I 1th, following'isaspecification.

i l y ention has reference to turntable for grainophone linachines' and consists of 1certain,iinprovernents which are fully set a" part thereof. p (I The object of rny invention is toprovide a "co ictionof'turntabl'e'fortalkingmachines ..15 \vlj 'ch shall ,e'rnbody accuracy of rotation,

jlightn'ess," and cheapnessof manufacture.

' He 'etofore, the turntables of sound reprod t jn f 'xhavefb een"inade heavy and of cast iron.

;. 2o The castings frequently Warp and give an ir gular surfacefor the reception of the soundi rdtabletand cause a very uneven 3 0 'TiVly" invention overcomes the objections inherent to the heavy cast iron turntables ab'oiietlpdinted out. Being light, my in1- proved turntable gets up itsspeed of rotationinorequickly at starting toproduce the properra'te. of vibration to secure the articulation of sound desired and yet, when the pressure of the/sound box and connections are transmitted to it through the stylus and record tablet, the drag, thus obtained,

My invention consists of the turntable of the motor part of a gramophone instrument when made of. sheet nietal'shaped to maintain aflat condition upon its upper surfacewhich acts as a support for the record disk.

More specifically, any invention compreliends the sheet metal turntable provided with a downwardly extending flange on its outer edge, an annulargroove or downwardly ex'tending'rib near-its outer edge and pref erably a series of radial downwardly extending ribs, said ribs radiating from the neighborhood of the hub.

My invention also embodies details of construction Which,- tog'ether Wltll llh features i Specification of Letters Patent.

Application filed October 12, Serial No. 338,536.

ave invented an Improvement in the 'folloiving lspecification and shown. 1 the accompanying drawings which form top for reception of the record disk.

acliines' oi' the gra'rnophone type;

lo tlie sanie', "s is injurious, in that I p s'is rna'de tofseriously affect the form ..25.' fu rooves because of the greater duty v. the

annular roove D. I

STATES PATENT @FFlQEl it I 4 or n I Lils ID'E, "P'EN N SYLV AN 1;..

TURN-TAB LE FOB .GB'AMOPHONE-MACHINE S.

Patented June 23, 1908.

Figure l, is a plan view of my improved turntablepl ig. 2 is a transverse section of the same; Fig. 3 is a cross section online of Fig. 1; Fig. 4 is an elevation of a artibn of a "grainophone instrument With my improved turntable applied, and Fig. Sis a plan View of a modification.

A is the disk turntable and isnaadeof 'metal preferably circular in forr'n, stamped at the same time present a hat surface on diskhas its outer edge flanged downward as th and also The above specified, Will be better understood by reference to the dranungs, in which;

into shape to brace it in all directions and "at B and the free edge is preferably turned inward as'at 'C. This adds stren shields theroughed e of the'metalfrom View.

Near the outer "flanged edge of theldi's'k and in the uppersurface thereof there is an annular depression I) which, While shallow, acts to hold the plate in a fiat condition; The surface of the plate between thieodte edge and" the annular groove D formsa flat band portion 1). i

The centralortion of the disk is forrne d with a hole ant also a series of radial grooves E preferably extending from the hub G to the prefer to hate the grooves deeper near thehub than at the outer portion ofthe disk so that theyiform' downwardly extending ribs on the under side Which are deeper adjacent to the hub to give great strength and also to have the grooves widened as they approach the groove D.

Gris the hub andmay be in the fornrof a flanged bushing.

The ribs E give depth to the disk adjacent to the center and being close together at this place act excellently to support the bushing' The turntable thus formed has a series of triangular portions and a circular portion fittedupon" the upright spindle I of the motor 105-- H.' K represents the sound box and stylus The turntable is and J is the record tablet supported on. the

turntable, in Fig. 4..

The outer edge may be stretched by making the flange B in other shapes, such as is HQ Lou stood that the ribs Emav be dispensed with or.modified as to length and width without departing from the spirit of. my invention. It 1s alsoevident that while I prefer the edge 'Ojto be bent inward, as shown, this may be omitted.

1 Having now described my invention what I claim as new and. desire to secure by Let- ,tersjPatent, is: e

1. A turntable for a talking machine, which consists of a disk of sheet metal having its outer edge provided withra downwardly extending flange, and its upper surface provided with an annular depressed ortion near theouter edge forming an-annu ar flat'band' portion. s v 2. A. turntable for a talking machine,

- which consists of a disk of'sheet metal having its outer edge provided with a downwardly extending flange, and its upper surface pro-- vided with an annular depressed ortion near the outer edge forming an annul sir flat band portion, and a series of-depressed portions extending from the-central part toward the on the'underside.

3. A turntable for a talking machine, which consists of a disk ofsheet metal having its outer edge provided witha downwardly;

extending flange, and its upper surface provided with an annular depressed ortion near the outer edgeforming an annu ar-flat'band portion, and a series of'depressed portions extendin from the central'part toward the annular epressed portion and forming ribs'on the underside, said ribs increasing in width as they approach said annular depressed por; tion. I

4. A turntable for a talking machine,

which consists of a disk of sheet metal having its outer edge'provided-with a downwardly extending flange, and its upper surface provided with an annular depressed ortion near thekouter edge forming'an annu ar fiat band portion, and a series of radially arranged depressed portions extending from the center outwardforming ribs upon the outer side, and a central bushing forming a hub for the support oftheturntable.

5. A turntable for talking machines made of sheet metal in' disk form and having a flange B at, its outer edgesaid flange having near its outer edge so as'to form an'annular surface D adjacent to the outer edge.

6. A turntable for talking machines made of sheet metal in disk form and having a flangeB at its outer edge and a series of radial depressed portions extending from the center outward.

center outward, and forming downwardly ex.- tending ribs upon the underside, said libs having greatest' -depth'near the center of the disk and ribs to form a hub. annular depressed portion and forming ribs 8. turntable for talking machinesconsisting of a disk of sheet metal having its the inwardly curved lower edgeC, and also... an annular depression D in its upper surface.

outer edge downwardly-flanged and its upper surface provided with de ressed portions to give it strength, combine with a covering of yielding material cemented to the surface of .the disk and bridging the depressed'portions thereof. 1

in testimony of which-invention, I have hereunto set my hand.

. EnNEs'r HOWARD HUNTER,-

, R. M.'KELLY. 

